CVE-2018-5504: F5 BIG-IP Access Policy Manager

High severity, CVSS 8.1. EPSS: 4.3% chance of exploitation in the next 30 days.

In some circumstances, the Traffic Management Microkernel (TMM) does not properly handle certain malformed Websockets requests/responses, which allows remote attackers to cause a denial-of-service (DoS) or possible remote code execution on the F5 BIG-IP system running versions 13.0.0 - 13.1.0.3 or 12.1.0 - 12.1.3.1.

Affected products

  • F5 BIG-IP Access Policy Manager: from 12.1.0, before 12.1.3.2 (fixed in 12.1.3.2); from 13.0.0, before 13.1.0.4 (fixed in 13.1.0.4)
  • F5 BIG-IP Advanced Firewall Manager: from 12.1.0, up to and including 12.1.3.2; from 13.0.0, before 13.1.0.4 (fixed in 13.1.0.4)
  • F5 BIG-IP Analytics: from 12.1.0, before 12.1.3.2 (fixed in 12.1.3.2); from 13.0.0, before 13.1.0.4 (fixed in 13.1.0.4)
  • F5 BIG-IP Application Acceleration Manager: from 12.1.0, before 12.1.3.2 (fixed in 12.1.3.2); from 13.0.0, before 13.1.0.4 (fixed in 13.1.0.4)
  • F5 BIG-IP Application Security Manager: from 12.1.0, before 12.1.3.2 (fixed in 12.1.3.2); from 13.0.0, before 13.1.0.4 (fixed in 13.1.0.4)
  • F5 BIG-IP Domain Name System: from 12.1.0, before 12.1.3.2 (fixed in 12.1.3.2); from 13.0.0, up to and including 13.1.0.4
  • F5 BIG-IP Edge Gateway: from 12.1.0, before 12.1.3.2 (fixed in 12.1.3.2); from 13.0.0, before 13.1.0.4 (fixed in 13.1.0.4)
  • F5 BIG-IP Global Traffic Manager: from 12.1.0, before 12.1.3.2 (fixed in 12.1.3.2); from 13.0.0, before 13.1.0.4 (fixed in 13.1.0.4)
  • F5 BIG-IP Link Controller: from 12.1.0, before 12.1.3.2 (fixed in 12.1.3.2); from 13.0.0, before 13.1.0.4 (fixed in 13.1.0.4)
  • F5 BIG-IP Local Traffic Manager: from 12.1.0, before 12.1.3.2 (fixed in 12.1.3.2); from 13.0.0, before 13.1.0.4 (fixed in 13.1.0.4)
  • F5 BIG-IP Policy Enforcement Manager: from 12.1.0, before 12.1.3.2 (fixed in 12.1.3.2); from 13.0.0, before 13.1.0.4 (fixed in 13.1.0.4)
  • F5 BIG-IP Webaccelerator: from 12.1.0, before 12.1.3.2 (fixed in 12.1.3.2); from 13.0.0, before 13.1.0.4 (fixed in 13.1.0.4)
  • F5 BIG-IP Websafe: version 1.0.0 only

Published 2018-03-22. Last modified 2026-06-17.